Category Archives: Unit Operations & Transport Phenomena

The defining equation for h is given as q1= hAAT (6-1) where A is the surface area, A T is the temperature driving force, and q 1 is the heat flow per unit time (i.e., in watts, etc.). Polymeric Materials: Characterization and Properties. 3. PR: ENGR 101 and PR or CONC: ( CHEM 116 or CHEM 118 .) Overview of traditional and emerging areas of chemical engineering, projects involving computational and programming tools, design projects, written and oral presentation of results, discussions of professional and ethical behavior relating to the engineering professions.

The integrated form of Eq. (7.57) is (7.60) where the first integral must be left in general form. Special emphasis is placed on problems appearing in chemical engineering applications. This in essence treats the system as if it were a pseudobinary. As a first step in the refining process, to reduce corrosion, plugging, and fouling of equipment and to prevent poisoning the catalysts in processing units, these contaminants must be removed by desalting (dehydration).

As can be seen in Figure 12-10, a total of eight ideal stages would be required. Metxner and Otto [M7] assumed that this average shear rate is linearly related to the 784 TRANSF’ORT PROPERTIES rotational speed N of the impeller: (15.33) The constant k, is determined in a pilot plant by measuring the power number Z$,,, Eq. (9.10), and using Fig. 9.7 to estimate the Reynolds number for agitation &, Eq. (9.9). If a thermocouple is inserted into the duct, will there be a sizeable error due to radiation? 9-21.

The surface of the plate is at temperature To, and the approaching fluid is at T,. What pressure difference will be needed? (a) Use Eq. 6.2-12 as a suitable equation for the friction factor. (b) How can this problem be solved using Fig. 6.2-2 if Eq. 6.2-12 is not appropriate? The operation is to be carried out at the same overall rate with an operating pressure of 1.7 atm. In a simi- lar way we can write UT; cos O1 cos 8, dQ, = - dAldA2 21 $2 which is the radiant energy emitted by dA2 that is intercepted by dA, per unit time.

This instrument is capable of very high shear rates. Students may not receive credit for both CENG 114 and NANO 114. A common set of formulation, simplification, and solution methods is applied first to heat or mass transfer in stationary media and then to fluid mechanics, convective heat or mass transfer, and systems involving various kinds of coupled fluxes. The viscosity of water at I2.1 12 J m sec O K The experimental value is 0.80 6.

Note that steady-state need not be assumed with regard to Eq. (3.74). Examines the role nanotechnology will play in addressing the many scientific and engineering challenges for new energy production. Altgelt, Advances in Chromatography, Vol. 7, Marcel Dekker, New York (1968). 39. Partly for this reason complete descriptions of membrane transport are rare (see, however, Scattergood and Lightfoot'). I40 50.176 32-194 32. 111% Sulfuric acid.

SO)GO TO 90 NO CONVERGENCE GO TO (80,S5),ISIGN SUBTRACT? Carman, Flow of Gases through Porous Media, Butterworths, London (1956); J. Similar compartmental models have wide application in medicine, where they are re- ferred to as pharmacokinetic model~ .~ A priori pharmacokinetic modeling, where model para- meters are determined separately from the process being modeled, was pioneered by Bischoff and Dedr i~k .~ In the foregoing example it is clear, even on casual inspection, that neither the body fluids nor the circulating blood have much in common with ideal mixing tanks, and it is therefore of Time and some interest to examine the success of the simple compartmental model critically.

Ease of maintenance 5.8 0.0 2.0 5. (With permission of W.o 0 1. In order to work this problem, we can use a trial-and-error method. Typical subjects include processing and properties of electronic and nanomaterials, composites and dispersions; mixing of particles and agglomerates; electrodeposition of alloys; molecular level simulations. The expansion’ loss coefficient k, is readily calculated through the mechanical energy balance, Eq. (10.23), and the integral momentum balance, Eq. (7.23).

Solution SOLUTION We begin by determining the pressure-flow relationship and note that we have two ways of doing this: the Blake-Kozeny equation (Eq. 24.6-14), and the diffusion-based result (Eq. 24.5- 20) of the previous section. Currently Dr Trujillo is working on achieving separation of particles and liquid droplets within emulsions via high frequency ultrasound, which can find several applications of importance for food, biological, pharmaceutical, chemical and petrochemical industries.

Both cases will be considered in this chapter. 5.1 CONVECTIVE FLUX CAUSED BY FORCED CONVECTION A convective flux contribution to the transfer of a property by forced convection must involve a flow velocity. Several of these subjects can satisfy the program's CI-M requirement. A similar hole is made at the south pole by removing the portion (.rr - 8,) 5 8 5 T. V)I) and V2 $ as given in Eqs. (3.53) and (3.64) respectively,, becomes If v were not constant, then Eq. (ii) would have to be expanded and, if p were also not constant, then Eq. (i) would have to be expanded.